package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    //构造方法注入
    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头的token
        String token = request.getHeader("authorization");
        System.out.println(token);
        if (StrUtil.isBlank(token)){
            //为空也不用拦截
            return true;
        }
        //基于token获取redis中的用户
        String key = LOGIN_USER_KEY + token;
        System.out.println("key="+key);
        Map<Object,Object> userMap = stringRedisTemplate.opsForHash()
                .entries(key);
        System.out.println("RefreshTokenInterceptor的userMap="+userMap);
        //判断用户是否存在
        if (userMap.isEmpty()){
            //哪怕为空也直接放行
           return true;
        }
        //将查询到的Hash数据转为UserDTO对象
        //fillBeanWithMap用map来填充bean；false不忽略类型转化过程中的错误
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);
        //存在保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        System.out.println("RefreshTokenInterceptor的userDTO"+userDTO);
        //刷新token有效期
        stringRedisTemplate.expire(key,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //放行
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}
